I have a 1997 silverado 5.7 v8 4x4 my
fuses are good the tail lights work but
my brake lights and turn signal don't
the 3rd light does work what could be
It has a stop lamp switch buy the brake pedal inside. It maybe bad. I had to change mind for difficulties on work brake lamp and it wasn’t work my turn signal lamp on the rear. I would give it a check first.